Granted Patent
Utility
US 4,218,331 · App. 05/927,458
Extreme pressure lubricating compositions
Inventors:
John D. Bacha, Robert W. Hill
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: Jul 24, 1978
Inventors
John D. Bacha
Robert W. Hill
Assignee (at issue)
Gulf Research & Development Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.